微型变压吸附分离空气制氧均压过程

Pressure equalization process of miniature PSA air separation for oxygen generating

通过切换压力、均压时间、高径比以及吸附塔进出口压力研究了微型变压吸附制氧均压过程.实验结果表明在实验条件下,氧气纯度随切换压力的增加先增加后减小,且不同的均压时间对应的最佳切换压力相同;氧气纯度随均压时间的增加也是先增加后减小,存在一个最佳均压时间,此最佳值由吸附塔的结构决定;高径比大的吸附塔对应的最佳均压时间比高径比小的吸附塔对应的最佳均压时间长;均压过程中,进气吸附塔内的压力增加迅速,均压结束后,吸附塔内压力变化缓慢,且进出口压力曲线基本保持平行.

The pressure equalization process of miniature pressure swing adsorption （PSA） for oxygen generating was experimentally investigated by changing the switching pressure, pressure equalization time, ratio of height to diameter, inlet and outlet pressure of an absorber. The experimental results show that, under the experimental conditions, the oxygen purity increases first and then decreases with increasing switching pressure, and with the change in time of pressure equalization the best switching pressure is constant. As the time of pressure equalization increasing, the oxygen purity also increases at the beginning then decreases. There must be a best time of pressure equalization, which is decided by the absorber＇ s structure. The bigger the ratio of height to diameter of the absorber is, the longer the best time of pressure equalization is. In the absorber of air flowing in, the pressure increases rapidly during the pressure equalization process, but its change is slow after the pressure equalization process. The pressure curves at the inlet and outlet are parallel.